Electric furnace blower won't shut off

Reply

  #1  
Old 02-20-14, 04:21 PM
B
Member
Thread Starter
Join Date: Feb 2014
Posts: 5
Received 0 Votes on 0 Posts
Electric furnace blower won't shut off

I've got an Arcoaire EF16J2200A1 electric furnace with a heat pump, serial # L0101 54153. Yesterday we realized the furnace blower never shut off and was blowing cold air. No matter what we did w/ the thermostat, it wouldn't shut off. I ended up shutting off the breaker on the front of the furnace which controls the blower, then turned the breaker back on, essentially resetting the blower. It stays off after that, until the heat needs to kick back on according to the thermostat...at which point the blower turns back on and won't shut off again until I kill the breaker.
I'm assuming there's a switch or relay gone bad somewhere but don't know where to begin.
 
Attached Images      
Sponsored Links
  #2  
Old 02-21-14, 11:45 AM
S
Member
Join Date: Feb 2014
Location: USA
Posts: 2,104
Received 0 Votes on 0 Posts
Can you post a picture of the wiring diagram?
 
  #3  
Old 02-21-14, 06:15 PM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,426
Received 17 Votes on 14 Posts
http://icpindexing.toddsit.com/docum...4201220103.pdf

I don't see a sequencer or fan control in this heat strip diagram so it would point to the furnace control board as the culprit if this is indeed your setup.

(It is strange that this PDF is in the furnace section instead of the air handler section of their site)
 
  #4  
Old 02-21-14, 07:26 PM
B
Member
Thread Starter
Join Date: Feb 2014
Posts: 5
Received 0 Votes on 0 Posts
updated pics

The only pic that would upload...the rest are linked to on Imgur...
 
Attached Images  

Last edited by bander88; 02-21-14 at 07:58 PM.
  #5  
Old 02-21-14, 07:30 PM
B
Member
Thread Starter
Join Date: Feb 2014
Posts: 5
Received 0 Votes on 0 Posts
more pics

trying to add more pics of the wiring diagram but I can't see how to upload multiple pics like i did in the original post.
imgur: the simple image sharer
imgur: the simple image sharer
imgur: the simple image sharer
 

Last edited by bander88; 02-21-14 at 07:58 PM.
  #6  
Old 02-21-14, 08:38 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 58,593
Received 1,045 Votes on 969 Posts
Nice pics bander..... well done.
With the pics linked like that we can expand them and see with detail. The pics you posted are identical to those in the link that Houston posted in post 3.

You don't have a heat sequencer board so the main control board controls the timing and operation of the blower fan and is suspected to be defective. Can you repost the pic below on imgur or reshoot the board and post the new pic on imgur.

Name:  jjk.jpg
Views: 2127
Size:  29.0 KB
 
  #7  
Old 02-22-14, 12:14 AM
B
Member
Thread Starter
Join Date: Feb 2014
Posts: 5
Received 0 Votes on 0 Posts
more pics of main control board

Thanks guys...let me know what else you need.

imgur: the simple image sharer
imgur: the simple image sharer
 
  #8  
Old 02-22-14, 06:04 AM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,426
Received 17 Votes on 14 Posts
I'd remove the 2 red wires from the control board the next time the fan acts up.
If the fan continues to run, this would eliminate the stat and field installed control wiring as the cause of this problem.
 
  #9  
Old 02-22-14, 06:38 AM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,426
Received 17 Votes on 14 Posts
I see some limit switches. Is your filter clean? Is the coil clean?

 
  #10  
Old 02-22-14, 09:38 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 58,593
Received 1,045 Votes on 969 Posts
Houston.... in the two pics of the control board.... I'm trying to figure out what that white two wire cable is for that is hooked up to G and R on the main board.

Name:  ts.jpg
Views: 2836
Size:  46.8 KB
 
  #11  
Old 02-22-14, 11:55 AM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,426
Received 17 Votes on 14 Posts
It looks like something is getting 24 volts when the fan terminal gets 24 volts.
Looks like it is connected between G and C so this relay does not appear to have the ability to turn on the fan.

It would be unusual for this to go to a humidifier relay when they have an H terminal on the board. Tracing that white wire to the other end might be a good idea.

 
  #12  
Old 02-25-14, 04:25 PM
B
Member
Thread Starter
Join Date: Feb 2014
Posts: 5
Received 0 Votes on 0 Posts
thanks for all the input guys... Really appreciate it. the filter was dirty but not dirtier than I've seen in the past. Interestingly enough since the day this happened several times, I've replaced the filter and haven't had this issue since. will the fan not shut off if it had a dirty filter? I've never had that happen before.
 
Reply
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: